Spring-fastener for phonographs.



H. BENSON.

SPRING FASTENER FOR PHONOGRAPHS.

APPLICATION FILED MAY 2!. 191

1,246,382. Patented Nov. 13, 1917.

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$1 Silica/(e4 TTED STATES PATENT OFFICE.

HELMER BENSON, OF BLOOMFIELD, NEW JERSEY, ASSIGNOR TO DE CAMP AND 'SLOAN, 1110., A GORPQBATION 9F NEW JERSEY.

SPRING-FASTENER FOR PHONOGRIAPHS.

Specification of Letters Patent.

Patented Nov. 13, 191 '7.

Application filed May 21, 1917. Serial No. 169,998.

To all whom it may concern:

Be it known that I, Hnmrnn BENSON, a subject of the King of Sweden, and resident of Bloomfield, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Spring- Fasteners for Phonographs, of which the following is a specification.

This invention relates to means formed on sleeves for securing thereto the inner ends of flat evolute springs that are suitably apertured therefor.

The object of the invention is to provide a fastening means of this character that can be readily formed by merely making an opening in the sleeve 011 one side, and then engaging the opposite wall of the sleeve by a punch and die, to force the metal of the sleeve outwardly and provide a kind of hook shaped lug; that will engage the inner apertured end of a band spring by merely sliding the spring on the sleeve and turning it until the hook engages the apertured end.

In the accompanying drawing illustrating one embodiment of my invention and means for forming it, Figure 1 is a longitudinal section through the sleeve. Fig. 2 is a longitudinal section through the spring barrel with the spring in place. Fig. 3 is a crosssection on the line 3-3 of Fig. 1. Fig. 4c is a similar view with the lug after being machined to reduce its thickness; and Fig. 5 shows means for forming the lug.

As shown in the drawing the sleeve 6 has a comparatively thick wall and on one side I provide an opening 7 Opposite this; opening the metal of the sleeve is forced outwardly to provide a lug or hook 8, as shown in Figs. 1 and 3. This lug extends somewhat tangentially as shown, and may be somewhat reduced by machining to produce the hook shaped lug 9 shown in Fig. 4. It will be understood from Fig. 2 that upon insertion of this sleeve 6 in the spring casing 10, it can be readily caused to engage the inner apertured end 12 of the evolute spring 13, whose outer end is shown as secured at 1A to the casing.

In Fig. 5 is shown one form of means for producing this lug. A die 15 is provided havin a cylindrical cavity 16 corresponding with that of the sleeve 8, and a socket 17 is Copies of this patent may be obtained for 7 in the sleeve, and is formed in section of proper rectangular shape, that its rounded end 19 when caused to engage the bore of the sleeve opposite the opening 7 will force the metal of the sleeve downwardly into the cavity of the die, whereby the lug 8 will be formed, as indicated in Fig. 3. As stated this lug may be machined or reduced on its inner and outer face to reduce its thickness, and provide the lug 9 as shown in Fig. 1.

It will thus be seen that a lug of this character is very easily formed by merely providing an opening or drilling a circular hole in the sleeve of slightly less diameter than the bore of the sleeve, then supporting the sleeve opposite the opening by the die, and then forcing the punch down through the said opening into the sleeve that will engage the wall of the bore and force the metal down into the cavity in the die, whereby the lug is formed. Slight reducing of the lug may be desirable but the lug could be used in its condition as made by the punch and die. Thus a lug of this character is very easily and cheaply constructed and will have sufficient rigidity to receive and hold the evolute spring at its apertured inner end.

Having thus described my invention, what I claim is 1. A sleeve fastening lug for coil spring connection consisting of a small sleeve having a comparatively thick wall, and having an opening in one side with the other side pressed outward to provide a hook shaped lug extending tangentially on the periphery of the sleeve adapted to engage the apertured inner end of a band coil spring.

2. The method of forming a peripheral hook lug on a thick walled sleeve, consisting in making a comparatively large opening in the sleeve wall in one side, supporting the opposite side by a recessed die, and inserting a punch through said opening to engage the bore opposite said die, and then forcing the punch toward the die to displace the sleeve metal down into the die socket to form a hook lug that will project tangentially from the periphery of the sleeve.

HELMER BENSON.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

